"The aim of this campaign has been to reduce to as close to zero as possible the number of cases of meningitis in the UK associated with these pilgrimages.

"Meningococcal infection is not only a serious threat to those travelling to the Hajj but also to their friends and family when they return.

"Last year's reduction in cases is a direct result of this campaign together with our work with the Muslim community and the government of Saudi Arabia, which has made it a requirement of entry to have a valid certificate showing that travellers have received the vaccine."